﻿using System;
using System.Collections.Generic;
using System.Text;

namespace BLL.Extensions.User
{

	/// <summary>  
	/// 验证身份证号码类  
	/// </summary>  
	public class IDCardValidation
	{
		/// <summary>  
		/// 验证身份证合理性  
		/// </summary>  
		/// <param name="Id"></param>  
		/// <returns></returns>  
		public bool CheckIDCard(string idNumber)
		{
			if (idNumber.Length == 18)
			{
				bool check = CheckIDCard18(idNumber);
				return check;
			}
			else if (idNumber.Length == 15)
			{
				bool check = CheckIDCard15(idNumber);
				return check;
			}
			else
			{
				return false;
			}
		}


		/// <summary>  
		/// 18位身份证号码验证  
		/// </summary>  
		private bool CheckIDCard18(string idNumber)
		{
			long n = 0;
			if (long.TryParse(idNumber.Remove(17), out n) == false
				|| n < Math.Pow(10, 16) || long.TryParse(idNumber.Replace('x', '0').Replace('X', '0'), out n) == false)
			{
				return false;//数字验证  
			}
			string address = "11x22x35x44x53x12x23x36x45x54x13x31x37x46x61x14x32x41x50x62x15x33x42x51x63x21x34x43x52x64x65x71x81x82x91";
			if (address.IndexOf(idNumber.Remove(2)) == -1)
			{
				return false;//省份验证  
			}
			string birth = idNumber.Substring(6, 8).Insert(6, "-").Insert(4, "-");
			DateTime time = new DateTime();
			if (DateTime.TryParse(birth, out time) == false)
			{
				return false;//生日验证  
			}
			string[] arrVarifyCode = ("1,0,x,9,8,7,6,5,4,3,2").Split(',');
			string[] Wi = ("7,9,10,5,8,4,2,1,6,3,7,9,10,5,8,4,2").Split(',');
			char[] Ai = idNumber.Remove(17).ToCharArray();
			int sum = 0;
			for (int i = 0; i < 17; i++)
			{
				sum += int.Parse(Wi[i]) * int.Parse(Ai[i].ToString());
			}
			int y = -1;
			Math.DivRem(sum, 11, out y);
			if (arrVarifyCode[y] != idNumber.Substring(17, 1).ToLower())
			{
				return false;//校验码验证  
			}
			return true;//符合GB11643-1999标准  
		}


		/// <summary>  
		/// 16位身份证号码验证  
		/// </summary>  
		private bool CheckIDCard15(string idNumber)
		{
			long n = 0;
			if (long.TryParse(idNumber, out n) == false || n < Math.Pow(10, 14))
			{
				return false;//数字验证  
			}
			string address = "11x22x35x44x53x12x23x36x45x54x13x31x37x46x61x14x32x41x50x62x15x33x42x51x63x21x34x43x52x64x65x71x81x82x91";
			if (address.IndexOf(idNumber.Remove(2)) == -1)
			{
				return false;//省份验证  
			}
			string birth = idNumber.Substring(6, 6).Insert(4, "-").Insert(2, "-");
			DateTime time = new DateTime();
			if (DateTime.TryParse(birth, out time) == false)
			{
				return false;//生日验证  
			}
			return true;
		}
	}
}
